An apparatus for determining the density of insulation in a cavity of a structure includes a sensor that is held in a substantially fixed position relative to the insulation for sensing the force of the insulation against the sensor. The force is used to determine the density of the insulation, which, in turn, is used to determine the thermal resistance or R-value of the insulation. The apparatus may include a fixture for supporting the sensor and holding the sensor in the substantially fixed position. A method for determining the density of loose-fill, blown-in-place insulation comprises the step of providing a structure with a cavity having a known depth. The cavity is filled with insulation. A sensor is held in a substantially fixed position relative to the insulation to measure force exerted on the sensor by the insulation. The measured force is used to determine the density of the insulation. The thermal resistance of the insulation is determined from the known cavity depth and insulation density.
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1. A method for determining the density of loose-fill, blown-in-place insulation in a cavity defined between framing members of a structure, the method comprising the steps of:
(a) providing a structure including framing members and a sheath forming at least one cavity having a known depth;
(b) filling the cavity with insulation;
(c) holding a sensor within the cavity in a substantially fixed position relative to the insulation in the cavity;
(d) measuring force exerted on the sensor by the insulation;
(e) using the force to determine the density of the insulation; and
(f) determining the thermal resistance of the insulation from the known cavity depth and insulation density.
5. A method for determining the density of loose-fill, blown-in-place insulation in a cavity defined between framing members of a structure, the method comprising the steps of:
(a) providing a structure including framing members and a sheath forming at least one cavity having a known depth;
(b) filling the cavity with insulation;
(c) providing a fixture for supporting a sensor positioned outside the cavity, wherein the fixture is in the form of a plate that supports the sensor against the insulation;
(d) holding the sensor in a substantially fixed position relative to the insulation in the cavity;
(e) measuring force exerted on the sensor by the insulation;
(f) using the force to determine the density of the insulation; and
(g) determining the thermal resistance of the insulation from the known cavity depth and insulation density.
10. A method for determining the density of loose-fill, blown-in-place insulation in a cavity defined between framing members of a structure, the method comprising the steps of:
(a) providing a structure including framing members and a sheath forming at least one cavity having a known depth;
(b) filling the cavity with insulation;
(c) providing a sensor in a substantially fixed position relative to the insulation in the cavity, wherein the sensor is an air cup that is pressed against the insulation;
(d) drawing air into the air cup at a given source pressure;
(e) measuring air pressure in the air cup, the air pressure being directly related to the density of the insulation;
(f) using the measured air pressure to determine the density of the insulation; and
(g) determining the thermal resistance of the insulation from the known cavity depth and insulation density.
9. A method for determining the density of loose-fill, blown-in-place insulation in a cavity defined between framing members of a structure, the method comprising the steps of:
(a) providing a structure including framing members and a sheath forming at least one cavity having a known depth;
(b) filling the cavity with insulation;
(c) providing a sensor in a substantially fixed position relative to the insulation in the cavity, wherein the sensor is an air cup that is pressed against the insulation;
(d) blowing air into the air cup at a given source pressure;
(e) measuring air pressure in the air cup, the air pressure being directly related to the density of the insulation;
(f) using the measured air pressure to determine the density of the insulation; and
(g) determining the thermal resistance of the insulation from the known cavity depth and insulation density.
8. A method for determining the density of loose-fill, blown-in-place insulation in a cavity defined between framing members of a structure, the method comprising the steps of:
(a) providing a structure including framing members and a sheath forming at least one cavity having a known depth;
(b) filling the cavity with insulation;
(c) providing a sensor in a substantially fixed position relative to the insulation in the cavity, wherein the sensor is an air cup that is pressed against the insulation;
(d) introducing air into the air cup from a source, with the air being supplied at a given source pressure;
(e) measuring air pressure in the air cup, the air pressure being directly related to the density of the insulation;
(f) using the measured air pressure to determine the density of the insulation; and
(g) determining the thermal resistance of the insulation from the known cavity depth and insulation density.
11. A method for determining the density of loose-fill, blown-in-place insulation in a cavity defined between framing members of a structure, the loose-fill insulation including an adhesive, the method comprising the steps of:
(a) providing a structure including framing members and a sheath forming at least one cavity having a known depth;
(b) filling the cavity with insulation;
(c) providing a sensor in a substantially fixed position relative to the insulation in the cavity, wherein the sensor is an air cup that is pressed against the insulation;
(d) blowing air into the air cup at a given source pressure;
(e) measuring air pressure in the air cup, the air pressure being directly related to the density of the insulation;
(f) using the measured air pressure to determine the density of the insulation; and
(g) determining the thermal resistance of the insulation from the known cavity depth and insulation density.
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This application is a continuation-in-part of U.S. patent application Ser. No. 10/969,427, filed Oct. 20, 2004, now abandoned entitled Apparatus and Method for Determining Density of Insulation which is a continuation-in-part of U.S. patent application Ser. No. 10/689,770, filed Oct. 21, 2003 which has issued as U.S. Pat. No. 6,928,859.
This invention relates in general to an apparatus and method for determining the density of insulation, and in particular, to an apparatus and method for determining the density of a loose-fill, blown-in-place fibrous insulation.
In recent years, a greater emphasis has been placed on the use of insulation materials in dwellings or other structures to promote energy conservation and noise reduction. At the same time, innovative architectural designs have created a variety of shapes and sizes that do not always lend themselves to the use of a conventional fibrous batting, which is often available in rolls of uniform width. The conventional fibrous batting often fails to fully fill the space in which the batting is used. This has created a need for a technique for applying fibrous insulation that does not use uniform width batting.
This need has been fulfilled to a limited extent by developing various blown-in-place insulation techniques, wherein loose-fill fibrous insulation is blown into a cavity between the framing members of the wall, ceiling, or floor of a dwelling. The loose-fill insulation is capable of completely filling the cavity, regardless of its shape and size, thus effectively achieving a uniform volume of insulation for optimum energy conservation, as well as sound insulation purposes.
While blown-in-place insulation techniques have addressed insufficient fill problems inherent with insulation batting, one of the advantages of batting lost to blown-in-place insulation is the batting's ability to maintain insulation quality. This includes, of course, the density and thickness of the fibrous insulation, which is important to achieve a uniform thermal resistance. The thermal resistance of the insulation batting is often associated with a given “R-value”. When insulation batting is purchased, for example, to place in a new dwelling, it is often purchased by specifying a desired R-value. If installed in accordance with minimal prescribed installing techniques, the purchaser, due to uniform dimensions of insulation batting, can be count on at the insulation value having a certain thermal resistance.
When a blown-in-place insulation technique is employed, the advantage of controlling R-value associated with batting is lost. As a consequence, it is often necessary to also employ a technique for determining the density of the blown-in-place insulation for assuring that the insulation has the desired R-value.
Various techniques have been employed for the determining density in blown-in-place fibrous insulations. In one technique, a known mass of loose-fill is blown into a cavity. The volume of the filled cavity is measured. The mass is divided by the cavity volume to get density. A problem with this technique is that it slows down the installation process of the insulation and therefore, is not used. Moreover, it is difficult to calculate the actual volume of insulation that is blown into the cavity because there are so many features (i.e., windows, doors, devices, etc.) in the area that take up volume.
In another known technique, a space is first filled with blown-in-place insulation. Then, a sample of insulation of a known volume is removed from a wall cavity and weighed. Since the volume of the sample is known, it is possible to determine the density (i.e., weight per volume) of the insulation in the cavity. The R-value of the insulation may then be determined in a known manner simply by knowing the thickness of the insulation in the cavity. In some instances, the quantity of insulation may be loose or compressed. As a consequence, error in determining the density of the insulation can be magnified if care is not taken to correctly remove the sample or average a number of samples. This is also a very time consuming technique and consequently is often not practiced by insulation installers.
In view of the above techniques, it is apparent that there exists a need in the art for an improved apparatus and method for installing insulation that is blown into open wall cavities to a prescribed density wherein the improved apparatus and method provide increased accuracy.
The above objects, as well as other objects not specifically enumerated, are achieved by an apparatus for determining the density of insulation in a cavity of a dwelling or other structure. The apparatus is in the form of a sensor that is held in a substantially fixed position within the cavity of the structure and relative to the insulation in the cavity for sensing the force of the insulation against the sensor. The force is used to determine the density of the insulation, which, in turn, is used to determine the thermal resistance or R-value of the insulation.
An alternative apparatus includes a sensor and a fixture supporting the sensor. The fixture is structured and dimensioned to hold the sensor in a substantially fixed position relative to the insulation within the cavity.
A method for determining the density of loose-fill, blown-in-place insulation comprises the initial step of providing a structure that includes framing members and a sheath forming at least one cavity having a known depth. A sensor is held in a substantially fixed position relative to the insulation in the cavity. Then, force exerted on the sensor by the insulation is measured. The measured force is used to determine the density of the insulation. The thermal resistance of the insulation is determined from the known cavity depth and insulation density.
Various objects and advantages of this invention will become apparent to those skilled in the art from the following detailed description of the preferred embodiment, when read in light of the accompanying drawings.
Referring now to the drawings, there is illustrated in
Insulation 20 is installed in the cavity 14 to prevent heat passage either outwardly or inwardly through the structure, and to minimize sound transmission therethrough. The insulation 20 is preferably a loose-fill, blown-in-place fibrous insulation. The insulation 20 may consist of any suitable material useful for insulation purposes. Such insulation 20 may be installed in a conventional manner, such as through use of a blower apparatus, not shown, which picks up the insulation in an air stream and carries the insulation to the cavity 14 through a tube or hose, also not shown. As shown in
An apparatus for determining the density of insulation 20 in the cavity 14 is schematically represented at 30 in
According to the present invention, the sensor 32 senses force F, or a change in force, which is used to determine density, as will be described in greater detail in the description herein below. Numerous embodiments of the apparatus 30 can be used to carry out the invention. Some examples of such embodiments are set forth in the following paragraphs.
In one embodiment of the invention, the sensor 32 is supported within the cavity 14. This may be accomplished by attaching the sensors to the sheathing 18 as shown in
In another embodiment of the invention, the sensor 32 is supported against the insulation 20 but is located outside the cavity 14. This can be accomplished in any suitable manner. For example, a fixture 34 could be provided for supporting the sensor 32, as schematically illustrated in
In
In
In
The sensor 32 according to one embodiment of the invention may be in the form of a load cell for measuring the force of the insulation 20 in the cavity 14. Such a sensor 32 would be suitable for use within or outside the cavity 14, as schematically represented in
In
In
In
In a subsequent step 116, a sensor is held in a substantially fixed position relative to the insulation in the cavity. In step 118, the sensor measures force exerted on the sensor by the insulation. In step 120, the force is used to determine the density of the insulation. In step 122, the thermal resistance of the insulation is determined from the known cavity depth and insulation density.
In optional step 124, the sensor is supported within the cavity. The sensor may be attached to the sheathing prior to filling the cavity with the insulation. When the insulation is blown into the cavity, the sensor senses the force exerted against the sensor by the insulation.
In an alternative step 126, a fixture is provided for supporting the sensor outside the cavity and holding the sensor in a substantially fixed position relative to the insulation. The fixture may be in the form of a standard supported by a supporting surface adjacent the cavity and the insulation therein. Alternatively, the fixture may be in the form of a plate that holds the sensor against the insulation. The plate could be held a distance from the framing members by legs that engage the framing members. Alternatively, the plate could be held a distance from the sheathing by pins that pass through the insulation and engage the sheathing. The pins could be adjusted in length to accommodate framing members having different dimensions.
The sensor of step 116 may be in the form of a load cell that senses the force of the insulation against the sensor. Alternatively, the sensor may be a digital or analog force transducer. The transducer can be held in a fixed position relative to the insulation with the fixture provided in step 126. A spring-force meter may be used in the place of the transducer. Alternatively, the sensor may be in the form of an air cup that is pressed against the insulation. It will be appreciated that if the sensor provided in step 116 is an air cup, then an optional step 128 may be performed in which air is introduced into the air cup at a given source pressure. In step 118, the force exerted is then determined by measuring the air pressure in the air cup, such as by using a gauge. The pressure in the air cup is directly related to the density of the insulation.
The aforementioned force transducer 48 and spring-force meter rely on the natural spring force of the loose-fill insulation to gage density. As the density of loose-fill insulation increases, the spring force increases proportionally. Using polynomial regression, an empirical relationship can be found between the density and the spring force of the loose-fill insulation. An example of a polynomial and empirical data relating to the relationship between the density and the spring force for is shown in
The embodiment of the apparatus or method that uses the air cup relies on the natural resistance to flow of the loose-fill insulation to create a pressure drop. For a given source pressure, the loose-fill insulation has a characteristic pressure drop for a given density. Further, back pressure created on the high-pressure side of the loose-fill insulation is directly proportional to density. Using polynomial regression, an empirical relationship can be found between the density and pressure drop. An example of a polynomial and empirical data relating to the relationship between the density and the pressure drop through the insulation is shown in
Factors that can affect either embodiment of the invention include the morphology, diameter, characteristic length, and shape of the fibers of the insulation factors, the binder content, if a binder is used, and other factors that are not mentioned.
The loose-fill thermal conductance, which is inversely proportionate to thermal resistance, can be related to the density by laboratory testing. The data can then curve fitted, as shown in
The principle and mode of operation of this invention have been explained and illustrated in its preferred embodiment. However, it must be understood that this invention may be practiced otherwise than as specifically explained and illustrated without departing from its spirit or scope.
Patent | Priority | Assignee | Title |
11162884, | Feb 26 2018 | CertainTeed Corporation | Devices and methods for determining the density of insulation |
11813833, | Dec 09 2019 | Owens Corning Intellectual Capital, LLC | Fiberglass insulation product |
Patent | Priority | Assignee | Title |
2755660, | |||
2912851, | |||
3524342, | |||
3590634, | |||
3788125, | |||
3808876, | |||
4052885, | Aug 24 1976 | The United States of America as represented by the United States Energy | Portable device and method for determining permeability characteristics of earth formations |
4095454, | May 31 1977 | Thermal insulation demonstration device | |
4177618, | Feb 06 1978 | Method and apparatus for installing insulation | |
4207674, | Mar 06 1978 | Wall scraping tool with bowed blade | |
4231129, | Dec 09 1977 | Cotton, Incorporated | Apparatus and method for impregnating a dry fiber batt |
4311037, | Mar 19 1980 | Scott Paper Company | Web permeability tester |
4337666, | Jun 30 1980 | Owens-Corning Fiberglas Technology Inc | Method and apparatus for measuring the expansion of a mat of fibrous material |
4401147, | Sep 28 1981 | Appleton Mills | Portable instrument for measuring the permeability of a papermaker's felt |
4459843, | Jul 06 1982 | GREGG, DAVID E , JR ; ZIOLKOWSKI, BEN | Apparatus and method for testing containers |
4506542, | Apr 22 1983 | CHANDLER ENGINEERING COMPANY, A COMPANY OF OK | Apparatus and procedure for relative permeability measurements |
4515007, | Jan 04 1983 | The United States of America as represented by the United States | Method of and apparatus for testing the integrity of filters |
4603618, | May 20 1985 | LUWALEPCO, INC | Air filtering and distribution for laminar flow clean room |
4649738, | Jan 13 1986 | The United States of America as represented by the Secretary of | Fluidic permeability measurement bridge |
4676091, | Oct 24 1985 | Gessner & Co. GmbH | Method and device for continuous measurement of porosity |
4679423, | Dec 16 1985 | Carrier Corporation | Method and apparatus for measuring the pore size of enhanced tubes |
4712347, | Oct 31 1986 | BLOW IN BLANKET, LLC | Method and apparatus for containing insulation using netting |
4815316, | Nov 05 1986 | City Technology Limited | Diffusion measurement |
4854011, | Dec 12 1986 | Rieter Machine Works, Ltd. | Method for automatically compensating density or thickness variations of fiber material at textile machines, such as cards, draw frames and the like |
4869197, | Feb 23 1988 | Bulge indicating method and device | |
4911021, | Apr 18 1986 | Air sampling apparatus | |
4979390, | Dec 01 1988 | Method and apparatus for testing relative permeability of materials | |
5005403, | Jul 25 1988 | STEUDLE, ERNST | Process and apparatus for the determination of the concentration of a substance dissolved in a solvent by means of an osmometer |
5036601, | Aug 06 1990 | CONAIR CORPORATION A CORP OF DE | Plastic air diffuser for hair dryers |
5051452, | Feb 13 1990 | The Dow Chemical Company | Process for preparing foamed vinylaromatic polymer products |
5060398, | May 02 1990 | JOHN WOLENS MARITAL TRUST DATED OCTOBER 22, 1991 | Air diffuser |
5157960, | Feb 06 1990 | Massachusetts Institute of Technology | Method and apparatus for transient measurement of gas permeability in closed-cell foam insulation |
5192348, | Aug 21 1991 | CES GROUP, LLC | Directional air diffuser panel for clean room ventilation system |
5209402, | May 24 1991 | Applied Materials, Inc | Laminar flow gas diffuser |
5287674, | Aug 13 1991 | BLOW IN BLANKET, LLC | Method and apparatus for containing insulation using a barrier assembly |
5353630, | May 01 1992 | USF FILTRATION AND SEPARATIONS GROUP INC | Apparatus for testing membrane filter integrity |
5355653, | Mar 29 1993 | Apparatus and method for installing loose fill or particulate insulation | |
5373727, | Apr 16 1993 | New Mexico Tech Research Foundation | Miniporopermeameter |
5417101, | Jun 10 1991 | Pall Corporation | Method and apparatus for testing the integrity of filter elements |
5445704, | Jan 18 1994 | Wallpaper applicator | |
5445792, | Mar 13 1992 | Teijin Limited | Optimum hydrogen peroxide vapor sterlization method |
5456104, | Jun 08 1992 | Normalized relative humidity instrument | |
5485754, | Apr 21 1994 | Intek, Inc.; INTEK, INC | Apparatus and method for measuring the air flow component and water vapor component of air/water vapor streams flowing under vacuum |
5505091, | Apr 05 1995 | Hurricane simulation testing apparatus | |
5509295, | Sep 16 1994 | ALTRONICS, INC | Weather station device |
5513515, | May 15 1995 | Modern Controls, Inc. | Method for measuring permeability of a material |
5594161, | Mar 24 1992 | Pall Corporation | Method and apparatus for rapidly testing the integrity of filter elements |
5595602, | Aug 14 1995 | SHENZHEN XINGUODU TECHNOLOGY CO , LTD | Diffuser for uniform gas distribution in semiconductor processing and method for using the same |
5633453, | Jan 19 1993 | Mayo Foundation for Medical Education and Research | Universal penetration test apparatus and method |
5641368, | Dec 14 1995 | KNAUF INSULATION, INC | Fiberglass spray insulation system and method with reduced density |
5698772, | Feb 27 1995 | Institut Francais du Petrole | Method and device for determining different physical parameters of porous material samples in the presence of two-phase or three-phase fluids |
5913546, | Dec 29 1997 | Flight-X Corporation | Stud alignment tool and method of use |
6047518, | Aug 31 1998 | KNAUF INSULATION, INC | Method and apparatus for installing blown-in-place insulation to a prescribed density |
6119506, | Jun 15 1998 | The United States of America as represented by the Secretary of the Army | Apparatus and method for determining transport properties of porous materials |
6330779, | Jun 28 2000 | HIGH-R, INC | Insulated ceiling for metal buildings and method of installing same |
6450009, | Apr 01 1998 | Method and device for measuring gas permeability through a porous membrane-like material | |
6463791, | Feb 13 1998 | CAR-BER INVESTMENTS INC | Weld testing assembly |
6521086, | Aug 11 1999 | JOHNS MANVILLE INTERNATIONAL, INC | Method of dispersing fibers |
6568282, | Feb 26 1999 | Evoqua Water Technologies LLC | Method and apparatus for evaluating a membrane |
6581451, | Sep 14 2001 | CertainTeed Corporation | Device for measuring density of material flowing in a conveying duct |
6591661, | May 30 2000 | STRUCTURAL MONITORING SYSTEMS LTD | Apparatus and method for measurement of permeability or strain in permeable materials |
6817941, | Oct 25 2001 | Bell Semiconductor, LLC | Uniform airflow diffuser |
6820819, | Mar 27 2002 | ARAGON, JESSE | Controlling insulation density |
6826920, | Dec 09 2002 | Honeywell International Inc. | Humidity controller |
6928859, | Oct 21 2003 | Owens Corning Intellectual Capital, LLC | Apparatus and method for determining density of insulation |
7055370, | Jun 07 2004 | Johns Manville | Device for conducting the on-site measurement of the density or thermal resistance of a material |
7055371, | Jun 07 2004 | Johns Manville | On-site measurement of the density or thermal resistance of a material |
7059173, | Jun 07 2004 | Johns Nanville | System for conducting the on-site measurement of the density or thermal resistance of a material |
7404260, | Nov 10 2005 | Johns Manville | Gauge and method for indicating one or more properties of a loose-fill insulation |
20030217588, | |||
20050268697, | |||
20070006664, | |||
20070113650, | |||
GB2103695, |
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Aug 03 2007 | OWENS-CORNING FIBERGLAS TECHNOLOGY, INC | Owens Corning Intellectual Capital, LLC | ASSIGNMENT OF ASSIGNORS INTEREST SEE DOCUMENT FOR DETAILS | 019795 | /0433 |
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